Hemstitch sewing-machine.



(N0 Modl.)

Patented-Oct. 24, I899. P. DIEHL & M. HEMLEB.

HEMSTITGH SEWING MACHINE.

(Application filed Mar. 22, 1899.)

4 Sheets-Sheet I.

WITNESSES:

no. 635,673. Patented Oct. 24, I899. P. DIEHL & m. HEMLEB.

HEMSTITCH SEWING MACHINE.

I (Application filed Mar. 22, 1899.) v (No Model.) 4 Sh eets$heei 2,

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Q 7 E\ J Patented Oct. 24, I899.- P. 'DIEHL & M. HEMLEB.

HEMSTJTCH SEWING MACHINE.

(Application filed Mar. 22, 1899.) (No Model.)

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No. 635,673. Patented Oct; 24, I899;

P. DIEHL 81. M. HEMLEB. HEMSTITCH SEWING MACHINE.

' (Application filed Mar. 22, 1899.) (No Model.) 4 Sheets-Sheet 4.

H null! E WITNESSES.

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NITED STATES PHILIP DIEHL AND MARTIN HEMLEB, OF ELIZABETH, NEVVJER SEY, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, OF NEW JERSEY.

HEMSTITCH SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 635,673, dated October 24,1899.

Application filed March 22, 1899.

To aZZ whom it may concern:

Be it known that we, PHILIP DIEI-IL and MARTIN HEMLEB,citizens of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing- Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to sewing-machines, and more particularly to hemstitch or openwork sewing-machines of that class in which vertically-reciprocating piercers to divide or separate the threads of the woven fabric are employed in connection with a vertically and laterally moving needle-bar and needle and irregular feed, the invention having for its object to provide a machine of this class which is simple in construction and positive and silent in operation, so that it is capable of being run at high speed, as also to provide a machine in which the piercer-bar is operated independently of the needle-bar, so that the piercer or piercers may descend in advance of the needle and may remain in the work after the needle has risen, so as to avoid any danger of catching the needle-thread on the point of the piercer adjacent to the needle.

In this improved machine the upward, forward, and backward movements ofthe feedbar are all positive and are preferably imparted to said feed-bar from a single rotating cam-wheel, which also preferably imparts lateral movements to the needle-bar and needle, while the needle and piercer bars, are reciprocated vertically but independently of each other from a single rotating crank-pin at the forward end of a driving-shaft journaled in the upper part of the bracket-arm of the machine.

In the accompanying drawings, Figure 1 is a side view, partly in vertical section, of the improved machine; and Fig. 2 is a bottom View thereof. Fig. 3 is a top View of the same, partly in horizontal section; and Fig. 4, is a front end View with the face-plate removed and with the presser-foot omitted for clearness of illustration. Fig. 5 is a detail View of part of the operating mechanism of Serial No. 710,115. (No model.)

theneedle and piercer bars. Fig. 6 is a dot-ail perspective view of the double crank from which the needle and piercer bars are oper-' ated, and Fig. 7 a detail view of part of the feed mechanism.

In the drawings, A denotes the bracketarm, and B the work-plate, of one style of Singer oscillating-shuttle sewing-machine embodying the present improvements.

0 is the driving-shaft, journaled in the upper part of the arm A and provided atits forward end with a crank-disk c, havinga crankpin 0, which is encircled by an eye formed at'the upper end of a pitman d, the lower end of which is connected to the needle-bar'D, so as to impart regular vertical movements thereto in a well-known manner. The driving-shaft 0 is provided with a bevel-pinion e,

meshing with a bevel-gear 6', attached to or formed integral with a cam-wheel E, having in which the needle-bar D has its bearings and in which said needle-bar reciprocates vertically. Theswingingneedle-barframeor gate (1 is pivoted on center screws d in the usual manner.

The crank-pinc of the disk c is provided with an offset 0 extending inwardly toward the shaft 0, and on which is formed a second crank-pin a engaging a cam-slot in a lever g, pivoted at g and provided with a stud 9 encircled by an eye on the upper end of a pitman 9 jointed at its lower end to a block or collar 9 attached to the piercer-bar G. The connected crank-pins c and 0 form a double crank, the primary crank-pin 0 being directly connect-ed to 'theneedle-bar, to impart a regular motion thereto, and being indirectly connected to the piercer-bar, so that the latter may have irregular or differential movements, owing to the fact that it is operated independently (or measurably so, at least) of the needle-bar. Theterm regular as herein employed with reference to the reciprocating movement of the needle-bar is intended to describe such a movement as the needle-bar will receive by reason of a direct pitman connection with a regularly-rotating crank, or, in other words, a movement which is uniformly accelerated from the time the needlebar commences to descend or rise until it reaches its maximum speed, and is then uniformly retarded to the end of its stroke. The term irregular or differential as herein used and describing the movements of the piercer-bar is intended to refer to reciproeating movements which are not uniformly accelerated or retarded, as are the movements of the needle-bar, these irregular or differential movements of the piercer-bar permitting the latter to descend in advance of the needlebar and to rise with or after the needle-bar has risen. The said piercer-bar is preferably provided at its lower end with an offset bracket or stock 9 to which one or more piercers g are secured by a suitable set screw or screws. The piereer with which the needle d is at times in juxtaposition is grooved on its side toward the needle, as is common with hemstich-machine piercers, so that the needle in descending into the holes in the fabric formed by the piercer will be partly housed within the same, so as to further push aside or divide the threads of the fabric already displaced by the piercer. When two or more piercers are employed, they are arranged one behind the other in the direction of the feed of the work and are spaced to coincide with the length of feed. The abovedescribed indirect or independent connection of the piercer-bar with the needle-bar-operating crank-pin admits of such a timing of the piercer-bar relative to the regularly-operated needle-bar as will permit the piercer-bar to be moved downward before the needle-bar, to cause the piercers to pierce the work to divide the threads thereof before the needle descends, and so that the piereers may remain in the work, if desired, after the needle rises.

The cam-wheel E is provided in its front face with a cam-groove 12", entered by a stud 7L, carried by the upper arm of an elbow-lever H, the lower or horizontal arm of which is preferably grooved for the adjustable con nection thereto of the upper end of a link h, connected at its lower end to an arm 2' of the feed-operating rock-shaft I, having near its forward end arms 1', between which the feed bar Jis pivotally mounted, so as to be moved positively forward and backward by virtue of the connections, just described, with the camgroove 6 The cam-wheel E has in its rear face a cam-groove e", entered by a roller-stud on the upper arm of a three-armed lever or rocker K, pivoted at to a part of the arm A, and to the lower arm of said lever K is attached the upper end of a connecting-rod m, jointed at its lower end to an arm it, near the rear end of a feed-lifting rock-shaft N, having near its forward end an arm n, provided with a roller-stud on which the feed-bar J rests, a spring 11 being in the present instance employed to press the said feed-bar down against said roller-stud.

The shuttle-operating mechanism prefer ably employed in the machine herein shown and described is that of the well known Singer overseaming machine, and comprises an oscillating shuttle (not shown) Working in the shuttle-race O and operated from a crank 11 on the driving-shaft 0 through a pitman p and rocker p suitably connected to a short transversely-arranged shuttle-operating rock-shaft at the forward end of the machine; but as this shuttle mechanism forms no part of the presentinvention it need not be further described. I

The machine constructed as herein shown is organized for three-stitch-pattern hemstitching, and in the formation of which threestiteh pattern the needle descends twice in the body of the goods and once in the hem, with the feed so timed that the goods will be fed backward between the first and second needle-punctures in the body of the goods, but will be fed forward between the second needle-puncture in the body of the goods and the puncture in the hem, as also between the puncture in the hem and the first puncture in the body of the goods. This result is effected, in the present instance, by the particular forms of the feeding-cams and of the cam for moving the needle-bar lat-erallyherein employed, and it will therefore be understood that the forms, as also the timing, of these cams maybe varied, so as to produce any of the well-known hemstitch-patterns which maybe desired. Thus in the present instance the cam-wheel E is geared to the drivingshaft 0, so as to perform one revolution to each three rotations of said shaft, while the needle-bar cam-groove e of said wheel is constructed to impart but one back-and-forth lateral movement to the swinging needle-bar frame or gate at each rotation of said camwheel, the needle-bar being retained in one of its lateral positions during about twothirds of the time occupied by the rotation of said cam-wheelv Also the feeding and feedlifting cam-grooves e and 6', respectively, of the said cam-wheel are in the present instance so constructed and relatively timed that the feed-bar will be moved back and forth horizontally twice during each rotation of the said cam-wheel, while the said bar will be raised and lowered but once during each rotation of said Wheel, one of the backward movements of the feed-bar occurring While the said feed-bar remains lifted, so as to produce the backward feed heretofore referred to. Ve do not therefore wish to be understood as limiting our invention to the particular constructions and relative timing of the cams or other parts herein shown and described, as the details of the invention may be varied widely within the province of mechanical skill without departing from the essence of the invention.

Having thus described our invention, we claim and desire to secure by Letters Patent-- 1. In ahemstitch sewing-m achine, the combination with a suitable feeding mechanism, of a needle-bar, means for moving said bar laterally, a rotating crank-pin connected to said needle-bar to impart-vertical movements thereto, a piercer-bar, a pitman connected to said piercer-bar and an intermediate connection between said crank pin and pitman whereby irregular or differential movements are imparted to said piercerbar from said crank-pin.

2. In ahemstitch sewing-machine, the com bination with a suitable feeding mechanism, of a rotating crank-pin, a needle-bar and means for moving the same laterally, apitman connecting said needle-bar with said crankpin, a piercer-bar, a vibrating operating device actuated by said crank-pin, and a pitman connecting said vibrating operating device with said piercer-bar; whereby the said needle-bar is adapted to have regular vertical movements and the piercer-bar irregular vertical movements, substantially as set forth.

3. In ahemstitch sewing-machine, the combination with a suitable feeding mechanism, of a rotating double crank, a needle-bar operatively connected to one part of said crank so as to have regular movements, a piercerbar, and a lever and pitman connecting said piercer-bar to the other part of said crank so that said piercer-bar will be differentially operated.

4. In a hemstitch sewing-machine, the combination with a driving-shaft arranged about the work-plate, of a needle-bar operatively connected to said driving-shaft to be reciprocated vertically, a feed-bar arranged below the work-plate, a swinging frame or gate in which said needle-bar is mounted, a single rotating cam wheel or device above the workplate and geared to said driving-shaft and provided with a needle-gate cam and two feed-cams,and connections between said cams and said frame or gate and said feed-bar, whereby said frame or gate is moved laterally and the said feed-bar is moved both horizontally and vertically at proper intervals.

- 5. In a hemstitch sewing-machine, the combination with a needle-bar mounted to move laterally and means for reciprocating said bar vertically, of a feed-bar arranged below the work-plate and a common rotating device above the work-plate connected to said feedbar to operate the same both vertically and horizontally and also connected to said needle-bar to impart lateral movements thereto.

6. In a hemstitch sewing-machine, the combination with a driving-shaft, of a laterallymovable needle-bar connected with said shaft to be reciprocated vertically, a feed-bar below the work-plate, and a rotating, feed-operating device above the work-plate geared to said drivingshaft and connected with said feed-bar to operate the same both verti cally and horizontally, and also connected to said needle-bar to impart lateral movements thereto.

'7. In a sewing-machine, the combination with the stitch-forming devices thereof, and with a driving-shaft to operate the same, of a feed-bar below the work-plate, two rock shafts also below the work-plate and connected with said feed-bar to move the said feed-bar vertically and horizontally, and a'rotating cam-wheel above the work-plate geared to .said driving-shaft and provided with two camgrooves, and connections between the said cam-grooves and rock-shafts.

8. In a sewing-machine, the combination with a stitch-forming mechanism comprising a vertically and laterally reciprocating needle-bar and a driving-shaft from which said bar is operated, of a feed-bar, two rock-shafts connected with said feed-bar to move the lat ter both horizontally and vertically, and a ro tating came-Wheel geared to said driving-shaft and provided with three cam-grooves,and con nections between said cam-grooves and said rock-shafts and needle bar whereby said bar will be moved laterally at intervals and where by also the said shafts will be rocked to impart proper movements to said feed-bar.

9. In a sewing-machine, the combination with the stitch-forming devices thereof and a driving-shaft for operating the same, of a feed-bar, means for moving the same vertically, a rock-shaft connected to said feed-bar to move the same horizontally, a cam geared to said driving-shaft and an elbow-lever above the machine work-plate and one arm of which is arranged to engage said cam and the other arm of which is connected to said rock-shaft.

10. In a sewing-machine, the combination with a driving-shaft, of a horizontally-swinging needle-bar frame, a needle-bar mounted therein and connected with said shaft to be reciprocated vertically, a feed-bar, two rockshafts for operating said feed-bar, a camwheel geared to said driving-shaft and provided with three cam-grooves, an elbow-lever operated from one of said cam-grooves and connected with said needle-bar frame to swing the said frame horizontally, a second elbowlever operated from another of said camgrooves and connected with one of said feedoperating rock-shafts, and a three-armed lever or rocker operated from the third one of said cam-grooves and connected with the other of said rock-shafts.

11. In a hemstitch sewing machine, the combination with a feeding mechanism, of a stitch-forming mechanism comprising a horizontally-swinging frame or gate and a needle- Iio bar mounted therein, of a rotating double In testimony whereof We afiix our signaclflilk-piglllOhge part of tvhich is cfinnected with tures in the presence of two Witnesses.

SELlC nee ear 0 reciproca e 1e same verticztlly, a piercer-bar, a lever provided with a slot entered by the other part of said crankpin and which lever is connected with said \Vitnesses:

piercer-bar to reciprocate the same Vertically HAROLD W. BROWN,

but in difierent time from said needle-bar. HENRY J. MILLER. 

